The plaintiff, as executrix of the estate of the decedent, Mildred Barone, brought this action against the defendants, Anthony Delibero, M.D., and Anthony Delibero, M.D., P.C.,1 alleging that the defendant Anthony Delibero, negligently administered general anesthesia to the plaintiffs decedent during an outpatient medical procedure, thereby causing her death. After a jury trial, a verdict was returned in favor of the defendants. The plaintiff has appealed, claiming that the trial court erred (1) in unfairly and inaccurately summarizing the evidence in its charge to the jury, (2) in denying the plaintiffs motion for mistrial and motion in arrest of judgment which were based on jury misconduct,2 and (3) in giving a supplemental charge to the jury that was erroneous and prejudicial to the *97plaintiff.3 We conclude that the trial court erred in denying the motion for mistrial and motion in arrest of judgment4 based on jury misconduct, and, therefore, it is unnecessary to consider the plaintiffs other claims of error.5
The record reflects the following relevant facts. On Wednesday, December 23, 1987, the second day of deliberations, at approximately noon, the jury sent a note, signed by the foreman, to the court. The note indicated that the jurors wanted to rehear the named defendant’s testimony regarding his monitoring of the decedent’s blood pressure and pulse during the surgical procedure and also inquired whether they had to be in unanimous agreement on each paragraph of the plaintiff’s complaint or whether they could disagree on one or more paragraphs and still arrive at a unanimous verdict. The note was marked as a court’s exhibit.
After reading the note, the judge informed the jurors that they would recess for lunch and that the rehearing of the requested testimony would begin at 2 p.m., after which the jury would be excused until the next day. The judge also stated that due to the complexity of the unanimity question, the question would not be answered until 10 a.m. the next day and that deliberations would not resume until that time. While the jury was recessed for lunch, the foreman of the jury twice attempted to deliver a note to the sheriff, which the sheriff refused to accept, because the entire jury had not yet reassembled. When the entire jury was assembled and court reconvened, the sheriff accepted the note *98and delivered it to the court. The note read: “We amend our previous request regarding Dr. DeLibero’s testimony to that presented when Mr. Fuchs questioned on the blackboard the time discrepancy regarding monitoring of the patient’s blood pressure. We wish to hear the doctor’s answer to this only. Also, we wish to remain in deliberation after this testimony today until 5 p.m.” The note was signed by the foreman and marked as a court’s exhibit.
After reading the note, and being aware of the attempts to deliver the note during the luncheon recess, the court expressed concern that jurors had been deliberating outside the jury room and during the time period in which deliberations had been suspended, pending the court’s response to the unanimity question. When the court inquired as to the circumstances under which the note had been written, the jury foreman stated that “there were four of us that had lunch together and we discussed this amongst ourselves,” and then composed the note. According to the foreman, after the four had approved the note, a fifth juror was informed of its contents and agreed to it. The foreman also stated that “most” of the jury understood that a unanimous decision on each paragraph of the complaint was required and wanted a simple yes or no answer to the unanimity question posed in the first note. The entire jury was present during the colloquy between the court and the foreman.
The court then informed the jury that the lunchtime discussion had violated the court’s instructions against deliberating outside of the jury room or in the absence of any juror and it repeated its instruction that no further deliberations were to take place until the unanimity question was answered, which would not be until Monday, December 28, 1987, rather than the following day as previously stated. The court told the jury that a decision as to what portion of the named defendant’s tes*99timony would be reheard would also not be made until that Monday and excused the jury until 10 a.m. on that date.
After the jury was excused, counsel for both parties informed the judge that a juror seemed to have been attempting to express disagreement with the foreman’s statements regarding the lunchtime discussion. The court called this juror back into the courtroom and inquired whether he had anything to add. The juror stated that he had wanted to say that he and another juror were not present at the lunchtime discussion. No further questions were asked of the juror, and he volunteered no other information.
The defendants then moved for a mistrial on the ground that the lunchtime discussion among the four jurors constituted improper deliberations, which rendered the trial unfair. The plaintiff subsequently joined in the defendants’ motion. All parties agreed in oral argument on the motion that the subject of the second note was not an inconsequential procedural matter and that improper deliberations by some of the jurors had occurred outside the courthouse. The court denied the motion, concluding that the discussion among the jurors did not demonstrate a sufficient risk of prejudice or unfairness to either side and that the four jurors had not discussed the evidence. Following the court’s acceptance of the jury’s verdict for the defendants, the plaintiff filed a motion in arrest of judgment based on the same claim of juror misconduct, which the court denied.
The plaintiff claims on appeal that the lunchtime discussion amounted to improper jury deliberations and occurred under circumstances that created a probability of prejudice. We agree.
The note sent by the four jurors as a result of the discussion among them revised the jury’s initial and *100earlier request to rehear certain portions of the named defendant’s testimony. The note indicated that, instead of wanting to rehear all of his testimony regarding his monitoring of the decedent’s blood pressure and pulse as requested by the first note sent by the entire jury, the four jurors wanted to hear only a specific portion of that testimony. This request could not have been formulated without a substantive discussion of the named defendant’s testimony.
It is not hypothetically likely that four members of the jury sought, in the second note, simply to clarify the thinking of the six members of the jury, as stated in the first note. We cannot assume logically that some or all of the jurors did not want to hear the testimony as originally requested at the time the first note was written, or assume that some or all of the jurors really meant to request a lesser amount of testimony when the first note was composed and that, therefore, the second note was a “unanimous” attempt to clarify the first note for all jurors, including the two absent jurors. We can assume logically only that the original note accurately embodied the concerns of some or all of the jurors. A substantive discussion of the evidence or issues in the case must have been conducted by four jurors in the absence of two jurors because, without such a discussion of the testimony, there could have been no determination by the four as to what specific lesser portion of the testimony was desired.
Although the foreman informed the court that the four jurors did not discuss any “evidence” in the case, it is not clear what he meant by “evidence” since he immediately went on to say that the four jurors wanted to “just hear that one portion of the testimony” because they wanted to continue deliberating and that “would be a shorter testimony.” Since the foreman admitted that the four jurors discussed the amount of the named defendant’s testimony they wanted to hear, while simul*101taneously stating that they had not discussed the evidence, it is not clear that the foreman understood that the word “evidence” includes “testimony.” This reading of the foreman’s remarks reconciles the foreman’s statement that the four jurors did not discuss evidence and his admission to the court that the four jurors had met together in the absence of the other two jurors and discussed the contents of the second note “amongst ourselves.”
In addition to the request to hear a lesser amount of the named defendant’s testimony, the note also indicated that the four jurors wished to continue deliberating until 5 p.m. that day. The note was silent as to the previous concern about unanimity. By stating that they wished to continue deliberating, instead of waiting until the court answered the unanimity question posed by the entire jury in the first note, the note impliedly indicated that the unanimity question was no longer of importance to the four jurors or no longer needed to be resolved by the court.
It is essential to a fair trial that all of the members of a jury be present while deliberations take place. “The term ‘deliberate’ means ‘[t]o weigh, ponder, discuss, regard upon, consider ... to weigh in the mind; to consider the reasons for and against.’ Black’s Law Dictionary (5th Ed.). Discussion is an integral part of deliberations.” State v. Washington, 182 Conn. 419, 427-28, 438 A.2d 1144 (1980). The conclusion is inescapable that deliberations took place in violation of the court’s instructions, outside of the jury room, in the absence of two jurors, and during a time when deliberations had been suspended.
The jury engaged in misconduct not only because they violated the court’s instructions but because they violated the juror’s oath in civil causes as provided in General Statutes § 1-25. The oath requires that a juror keep *102his “own counsel” and his or her “fellows” counsel and further requires that a jury shall not speak to anyone about the matter in hand except “among” the jury and only “in court.” The four jurors involved were engaged in deliberations that excluded some jurors and that occurred in a place other than the court house.
The reason for the requirement that all jurors be present to discuss a case together is to ensure a collective and unanimous factfinding process. The absence of one or more of them during deliberations can never be cured, even in the event all of them subsequently affirm a particular action of some of them. The give and take of a discussion without all jurors present subverts the collaborative process. There can never be a simulated recreation of the deliberations. The input of even one absent juror to the deliberative proceeding, whatever that input might have been, is forever lost, and cannot be revived. Ratification of the proceeding by an absent juror does not remedy the absence. Thus, even if the two excluded jurors eventually acquiesced in the content of the second note, which is not certain here, the damage to fairness and unanimity flowing from their absence during the discussion of the note cannot be repaired. The prejudicial impact on the verdict arising from the missing contribution of two of the jurors to a discussion could not be obviated even if it is assumed that the two jurors subsequently agreed to the contents of the note. See State v. Couture, 194 Conn. 530, 563, 482 A.2d 300 (1984), cert. denied 469 U.S. 1192, 105 S. Ct. 967, 83 L. Ed. 2d 971 (1985).
Every instance of jury misconduct does not require a new trial. State v. Washington, supra, 429; Hamill v. Neikind, 171 Conn. 357, 360, 370 A.2d 959 (1976). In reviewing juror misconduct, we use an objective standard in which the focus is on the nature and quality of the misconduct, rather than the mental processes of the jurors. Williams v. Salamone, 192 Conn. 116, *103122 n.7, 470 A.2d 694 (1984). The question is whether the misconduct is of such a nature as to make it probable that the misconduct resulted in prejudice and an unfair trial,6 Id. In a civil proceeding, the burden is on the moving party to establish the probability that the juror misconduct resulted in the denial of a fair trial. Id., 120.
“Juror misconduct in a civil proceeding does not by itself infringe constitutional rights; that question can only be determined after measuring the degree to which the misconduct affected the impartiality of the jury.” Id., 120. The burden of establishing the misconduct and its deleterious effect on the fairness of the trial is on the party claiming to have been harmed by the conduct. Hamill v. Neikind, supra, 360 n.5. In this case, it is anomalous that it was the defendants, who eventually were the beneficiaries of the jury verdict, who first moved for a mistrial. Because the plaintiff joined in the defendants’ motion, we decide, for the purpose of this appeal, that the burden of proof is on the plaintiff.
We conclude that, under the particular circumstances of this case, the jury misconduct at issue was sufficient to demonstrate a probability of prejudice, and that, therefore, the court erred in denying the motion for mistrial and the motion in arrest of judgment. “In this state it is required that jury verdicts be unanimous, requiring each juror to decide the case individually after impartial consideration of the evidence with the other jurors.” McNamee v. Woodbury Congregation of Jehovah’s Witnesses, 194 Conn. 645, 647, 484 A.2d 940 *104(1984) . In particular, the issue of liability should be determined by all of the jury because a party is entitled to a unanimous verdict. Id.
The deliberation among the four jurors was subversive of the parties’ right to have each juror decide the case individually after impartial consideration of the evidence with all of the other jurors on the panel and to their right to a unanimous conclusion of the jury as to liability. The exclusion of the two jurors from these deliberations is particularly troublesome in light of the fact that the jury, as indicated by the contents of the first note, may have been having difficulty reaching a unanimous decision, having requested a clarification as to what a unanimous verdict required.
The defendants contend that, because there was no outside interference with the deliberation process, either by communication with a nonjuror or by the consideration of nonevidentiary materials, the plaintiff has failed to show the probability of prejudice. Unlike, however, those cases involving outside interference, in which the question is whether and how the communication or nonevidentiary materials had an impact on the deliberation process; see e.g., State v. Asherman, 193 Conn. 695, 736-42, 478 A.2d 227, cert. denied, 470 U.S. 1050, 105 S. Ct. 1749, 84 L. Ed. 2d 814 (1984); this case involves the exclusion of two jurors from deliberations. The exclusion did not result from any action of the parties or the court. Cf. Aillon v. State, 168 Conn. 541, 363 A.2d 49 (1975).
That exclusion necessarily deprived the plaintiff of her right to have the jury reach a unanimous verdict based on the consideration of the evidence by all of the jurors together. Litigants in a civil case have a constitutional right to have questions of fact decided by a jury. Peck v. Jacquemin, 196 Conn. 53, 72, 491 A.2d 1043 (1985) . Questions of fact cannot fairly be decided by *105a jury without the presence and interaction of all of the jurors, and without a specific knowledge by the jurors of what unanimity requires. The very fact that four jurors met to discuss the case augered ill for the concept of unanimity on the verdict.
The trial court erred in denying the motions of all of the parties for a mistrial and in denying the plaintiff’s motion in arrest of judgment.
There is error, the judgment for the defendants is set aside and the case is remanded for a new trial.
In this opinion Norcott, J., concurred.
The plaintiff originally also brought this action against other members of a professional group with which the defendant was associated. The case was withdrawn as to those defendants prior to trial.
It was the defendants who moved for a mistrial. The plaintiff subsequently joined in the defendants’ motion.
This claim includes a claim that the trial court abused its discretion by submitting interrogatories prepared by it to the jury in the middle of its deliberations.
Because the bases of the plaintiff’s motion for mistrial and motion in arrest of judgment were the same, it is unnecessary to consider these claims separately.
The claimed errors regarding the court’s charge and supplemental charge are not likely to recur on retrial.
Cases prior to Williams v. Salamone, 192 Conn. 116, 470 A.2d 694 (1984), indicate a standard of juror misconduct of such a nature as to make it possible, rather than probable that the misconduct resulted in prejudice. Hamill v. Neikind, 171 Conn. 357, 370 A.2d 959 (1976); Felix v. Hall Brook Sanitarium, 140 Conn. 496, 101 A.2d 500 (1953). Williams uses a standard of probability and it is that standard that we use in the present case.